Fiorentina has now emerged as the favorite to land Giaccherini although a January deal, to add to the loan signings of Antonio Rosati, Alessandro Matri and Manchester United midfielder Anderson, looks highly unlikely.

Gus Poyet is reluctant to do business during the winter window and part with a player whom he believes can make a significant contribution in the club's battle to avoid relegation from the Premier League.

Giaccherini has thus far appeared in 17 league games for the bottom-of-the-table Black Cats, although a summer move to Vincenzo Montella's Fiorentina would be an attractive option for the player, with the Italian club on course to finish the season in the Champions League spots.